Do you have a source for his having confessed?
If the amount of duress applied was anything like what was used on Covington and then, Cooper, in the Mahoney case, you could get any FReeper on the board to confess to the crime, me included. Whether they had ever been in Virginia, or not.
Do a search yourself. It's there and it isn't hard to find. I'm not doing your work for you. You're the one putting out this hypothesis. All I did was look into a few things. Those that want to see will see.